ABSTRACT
A NE230 deuterated liquid scintillator detector (25 mm diameter x 25 mm) has been used to investigate neutron energy spectra as a function of position in a water phantom under irradiation by a quasi-monoenergetic 64 MeV neutron beam. Neutron energy spectra are obtained from measurements of pulse height spectra by the NE230 detector using the Bayesian unfolding code MAXED. The experimentally measured energy spectra are compared with spectra calculated by Monte Carlo simulation using the code MCNPX.
Subject(s)
Neutrons , Radiation Monitoring/instrumentation , Radiation Protection/instrumentation , Scintillation Counting/instrumentation , Spectrum Analysis/instrumentation , Water/chemistry , Equipment Design , Equipment Failure Analysis , Radiation Dosage , Radiation Monitoring/methods , Radiation Protection/methods , Reproducibility of Results , Scattering, Radiation , Scintillation Counting/methods , Sensitivity and Specificity , Spectrum Analysis/methodsABSTRACT
A stacked scintillator neutron spectrometer (S3N) consisting of three slabs of liquid organic scintillator is described. A pulsed beam providing a broad spectrum of neutron energies is used to determine the detection efficiency of the spectrometer as a function of incident neutron energy and to measure the pulse height response matrix of the system. Neutron spectra can then be determined for beams with any kind of time structure by unfolding pulse height spectra measured by the S3N. Examples of fluence spectrum measurements in the energy range 20-150 MeV are presented.
